The main aim of the project was the prior qualification of motor-vehicle steels with a view to the development of lighter mechanical components and the selection of more suitable materials for their manufacture. The qualification process involved fatigue tests (elastic and elastoplastic) and racture-mechanics tests, which were conducted either on traditional steels or on newly developed materials. The following industrially produced materials, which are cast as ingots, were examined: three hardening and tempering steels - including one manufactured in three forms (standard, resulphurized, Ca-treated) -, three micro-alloy steels in the form of bars and sections and two hot-rolled HSLA strip steels. All the fatigue-test results suggest a definite possibility of replacing hardened and tempered steels by micro-alloy steels of apropriate composition and structure. Stress-useful life curves, which provide a better indication of the behaviour of of the materials in use, reveal that, in the case of elastoplastic strength in particular, the performance of micro-alloy steels is superior or at least equal to that of hardenee and tempered steels of equivalent strength. A more comprehensive approach to the question of actual behaviour in use must also take account of the true significance of toughness, which must be defined with reference to component type.
Promotion of the use of steels in motor vehicles through evaluation of their properties in relation to design for finite life (1st phase). Final report
Foerderung der Anwendung von Staehlen fuer den Kraftfahrzeugbau durch Bewertung ihrer Eigenschaften in bezug auf die Konstruktion fuer eine finite Lebensdauer (1. Phase). Abschlussbericht
1987
77 Seiten, 30 Bilder, 17 Tabellen, 28 Quellen
Report
English
WERKSTOFFWAHL , MIKROLEGIERTER STAHL , HOCHFESTER STAHL , MIKROGEFUEGE , GROBBLECH , FAHRZEUGBAUTEIL , KRAFTWAGEN , VERGUETUNGSSTAHL , UNLEGIERTER STAHL , NIEDRIGLEGIERTER STAHL , DAUERFESTIGKEIT , KERBSCHLAGZAEHIGKEIT , BRUCHZAEHIGKEIT , WARMGEWALZTES BLECH , NICHTMETALLISCHER EINSCHLUSS , KALTGEWALZTES BLECH , STABSTAHL , BAND (METALL) , BRUCHMECHANISCHE PRUEFUNG , SPANNUNGS-DEHNUNGS-DIAGRAMM , ZYKLISCHE BELASTUNG , ZUGFESTIGKEIT
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